Quote Originally Posted by D.C. View Post
I had thought about that but I was getting concerned with the weight
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Do the struts really need the mass of the main beams or were you suggesting that for ease of construction?
I wouldn't worry about the weight too much from the point of view of the stepper motor(s). Try using irving's motor calculation spreadsheet and you'll see how little difference an extra 20kg out of 80kg will make. I was just suggesting it for ease of construction but there is no reason to assume I meant make all the box section the same size.